fermentation selected slides - pgia.ac.lk · alcoholic fermentation alcoholic fermentation of...

FERMENTATIONSelected slides

FT 5105 Food Microbiology

FT 5105 Food Microbiology 2

FT 5105 Food Microbiology 3

Alcoholic Fermentation

Alcoholic fermentation of glucose

C6H12O6 → 2 C2H5OH + 2 CO2glucose ethanol carbon dioxide

Glucose Glycolysis Pyruvic Acid

AcetaldehydeEthyl Alcohol

CO2

ATPATP

NADHNADH

NAD+

NAD+

Lactic Acid Fermentation

Fermenters

FT 5105 Food Microbiology 6

FT 5105 Food Microbiology 7

FT 5105 Food Microbiology 8

Industrial Fermentation Process

FT 5105 Food Microbiology 9

FT 5105 Food Microbiology 10

FT 5105 Food Microbiology 11

FT 5105 Food Microbiology 12

Culture Action Diary Product

L. delbrueckii bulgaricus

Acid and flavor Bulgarian butter milk

L. Acidophilus Acid Acidophilus milk

Leuconostoc cremoris

Flavor Cultured buttermilk, sour cream, cottage cheese

S. lactis diacetylactis

Acid and flavor Sour cream, buttermilk

L. lactis and bulgaricus and yeast

Acid and alcohol Kefir & Kumiss

S. faecalis Acid and flavor Swiss and Cheddar cheese

FT 5105 Food Microbiology 14Mashing vessels

FT 5105 Food Microbiology 15

Lauter Tun

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Hops

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Fermentation tanks

FT 5105 Food Microbiology 18Beer production process flow diagram

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Beer production process

FT 5105 Food Microbiology 20

A

B

C

DE

F

A-B - Germicidal actionB-C - S. lactisC-D - LactobacillusD-E - molds (oxidize

acids) + yeasts (produce NH3)

E-F - Proteolytic spore former bac.

Aci

dit

y %

Time

Sequence of changes in raw milk in relation to acid concentration

FT 5105 Food Microbiology 21

Aci

dit

y %

Time (days)

Sequence of acid fermentation in sauerkraut production

L. mesenteroides

L.curcumeris

L. Pentoaceticus & L. plantarum